Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Total revenue	$ 212,845	$ 188,857	$ 418,282	$ 361,355
Operating income / (loss)	11,336	16,725	20,249	31,728
Total assets	1,255,541		1,255,541		$ 1,232,015
Amortization and depreciation	7,775	7,477	15,536	14,862
Additions to property and equipment			26,302	7,381
Alarm.com
Segment Reporting Information [Line Items]
Amortization and depreciation	7,500	7,400	14,900	14,700
Additions to property and equipment	24,100	2,700	25,700	6,200
Other
Segment Reporting Information [Line Items]
Amortization and depreciation	300	100	600	200
Additions to property and equipment	100	100	100	100
Operating Segments | Alarm.com
Segment Reporting Information [Line Items]
Total revenue	201,286	179,511	397,855	345,043
Operating income / (loss)	16,918	19,456	29,671	37,163
Total assets	1,295,908		1,295,908		1,264,416
Operating Segments | Other
Segment Reporting Information [Line Items]
Total revenue	13,001	11,197	23,182	19,333
Operating income / (loss)	(5,725)	(2,842)	(9,728)	(5,696)
Total assets	39,651		39,651		37,198
Intersegment Eliminations | Alarm.com
Segment Reporting Information [Line Items]
Total revenue	(1,344)	(779)	(2,243)	(1,684)
Operating income / (loss)	168	233	354	387
Total assets	(80,061)		(80,061)		(69,595)
Intersegment Eliminations | Other
Segment Reporting Information [Line Items]
Total revenue	(98)	(1,072)	(512)	(1,337)
Operating income / (loss)	(25)	$ (122)	(48)	$ (126)
Total assets	$ 43		$ 43		$ (4)
Segment Concentration Risk | Revenue | Alarm.com
Segment Reporting Information [Line Items]
Concentration risk percentage	94.00%	95.00%	95.00%	95.00%
SaaS and license revenue
Segment Reporting Information [Line Items]
Total revenue	$ 129,475	$ 113,186	$ 252,700	$ 220,569
SaaS and license revenue | Operating Segments | Alarm.com
Segment Reporting Information [Line Items]
Total revenue	119,128	104,897	234,476	206,159
SaaS and license revenue | Operating Segments | Other
Segment Reporting Information [Line Items]
Total revenue	10,347	8,289	18,224	14,410
SaaS and license revenue | Intersegment Eliminations | Alarm.com
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
SaaS and license revenue | Intersegment Eliminations | Other
Segment Reporting Information [Line Items]
Total revenue	0	0	0	0
Hardware and other revenue
Segment Reporting Information [Line Items]
Total revenue	83,370	75,671	165,582	140,786
Hardware and other revenue | Operating Segments | Alarm.com
Segment Reporting Information [Line Items]
Total revenue	82,158	74,614	163,379	138,884
Hardware and other revenue | Operating Segments | Other
Segment Reporting Information [Line Items]
Total revenue	2,654	2,908	4,958	4,923
Hardware and other revenue | Intersegment Eliminations | Alarm.com
Segment Reporting Information [Line Items]
Total revenue	(1,344)	(779)	(2,243)	(1,684)
Hardware and other revenue | Intersegment Eliminations | Other
Segment Reporting Information [Line Items]
Total revenue	(98)	(1,072)	(512)	(1,337)
Software license revenue | Alarm.com
Segment Reporting Information [Line Items]
Total revenue	$ 6,900	$ 8,300	$ 14,000	$ 17,000